Quarterly report pursuant to Section 13 or 15(d)

NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Cumulative Effect of ASU 2014-09 (Details)

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NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Cumulative Effect of ASU 2014-09 (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Jan. 01, 2018
Dec. 31, 2017
Assets            
Accounts receivable $ (3,850)   $ (3,850)     $ (2,606)
Other long-term assets (678)   (678)      
Prepaid income tax (see Note 10) 2,331   2,331     0
Liabilities and Stockholders' Equity            
Retained earnings 34,042   34,042     5,555
Income Statement            
Provision (benefit) for income taxes (2,252) $ 0 11,135 $ 269    
Net income (loss) (7,619) $ (4,237) 28,638 $ 8,883    
Calculated under Revenue Guidance in Effect before Topic 606            
Assets            
Accounts receivable 0   0      
Other long-term assets 0   0      
Prepaid income tax (see Note 10) 2,695   2,695      
Liabilities and Stockholders' Equity            
Retained earnings 29,878   29,878      
Adjustments due to ASU 2014-09            
Assets            
Accounts receivable (3,850)   (3,850)      
Other long-term assets (678)   (678)      
Prepaid income tax (see Note 10) 364   364      
Liabilities and Stockholders' Equity            
Retained earnings 4,164   4,164      
Accounting Standards Update 2014-09            
Assets            
Accounts receivable         $ (5,156)  
Liabilities and Stockholders' Equity            
Retained earnings         8,105  
Income Statement            
Revenues 0   82,300      
Provision (benefit) for income taxes (2,252)   11,135      
Net income (loss) 2,252   71,165      
Accounting Standards Update 2014-09 | Calculated under Revenue Guidance in Effect before Topic 606            
Assets            
Accounts receivable           (2,606)
Liabilities and Stockholders' Equity            
Retained earnings           $ 5,555
Income Statement            
Revenues 1,300   81,000      
Provision (benefit) for income taxes (1,888)   10,771      
Net income (loss) 3,188   70,229      
Accounting Standards Update 2014-09 | Adjustments due to ASU 2014-09            
Assets            
Accounts receivable         (2,550)  
Liabilities and Stockholders' Equity            
Retained earnings         $ 2,550  
Income Statement            
Revenues (1,300)   1,300      
Provision (benefit) for income taxes (364)   364      
Net income (loss) $ (936)   $ 936