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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Cash flows from operating activities:    
Net loss $ (1,709) $ (9,152)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:    
Depreciation and amortization 8,678 10,176
Noncash compensation 235 258
Deferred income tax benefit (33) (16)
Change in other accrued long-term liabilities   (1,465)
Loss (gain) on disposal of assets 10 (1,108)
Other 174 33
Change in current assets and liabilities:    
Increase in accounts receivable (9,036) (8,102)
Increase in prepaid expenses and other current assets (1,755) (47)
Increase in accounts payable 2,845 1,424
Increase in accrued liabilities 1,826 2,381
Decrease in deferred revenue (481) (1,131)
Net cash provided by (used in) operating activities 754 (6,749)
Cash flows from investing activities:    
Capital expenditures, net of noncash capital expenditures summarized below (4,120) (3,401)
Proceeds from maturity of short-term investments 11,000 26,250
Acquisition of short-term investments (12,000) (2,000)
Proceeds from disposal of assets 57 240
Proceeds from flood insurance claims 687  
Net cash (used in) provided by investing activities (4,376) 21,089
Cash flows from financing activities:    
Principal payments on notes payable (27) (949)
Principal payments on capital lease obligations (663) (152)
Tax withholdings related to stock-based compensation awards (23) (49)
Net cash used in financing activities (713) (1,150)
Effect of exchange rate changes on cash and cash equivalents (70) 6
Net (decrease) increase in cash and cash equivalents (4,405) 13,196
Cash and cash equivalents at beginning of period 22,013 14,624
Cash and cash equivalents at end of period 17,608 27,820
Supplemental cash flow information:    
Cash paid for interest 74 22
Cash received for income taxes   1,356
Noncash investing and financing activities:    
Increase in accrued purchases of property and equipment 315 566
Financed insurance premiums $ 304 248
Equipment sales financed for buyer   (1,500)
Sales tax on equipment sales financed for buyer   $ (132)