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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Cash flows from operating activities:    
Net loss $ (11,383) $ (7,420)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Depreciation and amortization 11,406 16,070
Operating lease cost 610  
Noncash compensation 664 565
Deferred income tax benefit (131) (169)
(Gain) loss on disposal of assets (73) 29
Remeasurement and other (191) 287
Change in current assets and liabilities:    
Decrease in accounts receivable 8,802 4,434
Decrease (increase) in prepaid expenses and other current assets 3,775 (4,176)
(Decrease) increase in accounts payable (635) 2,302
Increase in accrued liabilities 1,747 127
Decrease in operating lease liabilities (559)  
(Decrease) increase in deferred revenue (1,963) 789
Net cash provided by operating activities 12,069 12,838
Cash flows from investing activities:    
Capital expenditures, net of noncash capital expenditures summarized below (3,057) (6,152)
Proceeds from maturity of short-term investments 18,000 27,000
Acquisition of short-term investments (18,000) (28,000)
Proceeds from disposal of assets 223 242
Proceeds from flood insurance claims   687
Proceeds from notes receivable 25  
Net cash used in investing activities (2,809) (6,223)
Cash flows from financing activities:    
Principal payments on notes payable (2,331) (109)
Principal payments on finance leases (1,407) (1,336)
Tax withholdings related to stock-based compensation awards (235) (39)
Cash in lieu of stock dividend paid   (1)
Net cash used in financing activities (3,973) (1,485)
Effect of exchange rate changes on cash and cash equivalents 262 (388)
Net increase in cash and cash equivalents 5,549 4,742
Cash and cash equivalents at beginning of period 28,729 22,013
Cash and cash equivalents at end of period 34,278 26,755
Supplemental cash flow information:    
Cash paid for interest 274 158
Cash paid for income taxes 14  
Cash received for income taxes 55  
Noncash investing and financing activities:    
Decrease in accrued purchases of property and equipment (899) (584)
Finance leases incurred 40  
Increase in right-of-use assets and operating lease liabilities 8,226  
Decrease in right-of-use asset for accrued rent (497)  
Increase in right-of-use asset for prepaid rent 14  
Financed insurance premiums $ 337 $ 304