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Recent Accounting Pronouncements - Impact of Adoption of ASC 842 (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating lease right-of-use assets $ 986    
Total assets 213,890   $ 223,524
Accrued liabilities 10,945   15,371
Total current liabilities 16,949   28,709
Long-term portion of lease obligations 895    
Total liabilities 18,235   28,992
Total liabilities and equity 213,890   223,524
Accounts Receivable, Net, Current 18,275   19,586
Lease liability $ 1,016    
ASU 2016-02      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating lease right-of-use assets     1,086
Total assets     1,086
Accrued liabilities     128
Total current liabilities     128
Long-term portion of lease obligations     958
Total liabilities     1,086
Total liabilities and equity     $ 1,086
Adjustment [Member] | ASU 2016-02      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating lease right-of-use assets   $ 1,086  
Total assets   224,610  
Accrued liabilities   15,499  
Total current liabilities   28,837  
Long-term portion of lease obligations   958  
Total liabilities   30,078  
Total liabilities and equity   224,610  
Lease liability   $ 1,100