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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Cash flows from operating activities:    
Net loss $ (5,347) $ (9,385)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Depreciation and amortization 13,412 16,644
Operating lease cost 916 903
Non-cash compensation 600 951
Deferred income tax expense (benefit) 79 (209)
Change in other accrued long-term liabilities (150)  
Gain on disposal of assets (3) (85)
Remeasurement and other 68 (118)
Change in operating assets and liabilities:    
Decrease (increase) in accounts receivable 19,373 (10,549)
Decrease in prepaid expenses and other assets 4,505 2,303
(Decrease) increase in accounts payable (2,957) 1,793
(Decrease) increase in accrued liabilities (2,011) 2,332
Decrease in operating lease liabilities (930) (852)
Decrease in deferred revenue (3,107) (2,531)
Net cash provided by operating activities 24,448 1,197
Cash flows from investing activities:    
Capital expenditures, net of non-cash capital expenditures summarized below (2,822) (3,649)
Proceeds from maturity of short-term investments 1,767 28,000
Acquisition of short-term investments   (24,842)
Proceeds from disposal of assets 225 272
Proceeds from notes receivable 26 38
Net cash used in investing activities (804) (181)
Cash flows from financing activities:    
Proceeds from notes payable 6,374  
Principal payments on notes payable (8,393) (7,867)
Principal payments on finance leases (2,291) (2,126)
Tax withholdings related to stock-based compensation awards (70) (236)
Net cash used in financing activities (4,380) (10,229)
Effect of exchange rate changes on cash and cash equivalents and restricted cash (113) 154
Net increase (decrease) in cash and cash equivalents and restricted cash 19,151 (9,059)
Cash and cash equivalents and restricted cash at beginning of period 31,271 28,729
Cash and cash equivalents and restricted cash at end of period 50,422 19,670
Supplemental cash flow information:    
Cash paid for interest 89 390
Cash paid for income taxes 83 14
Cash received for income taxes 206 55
Non-cash operating, investing and financing activities:    
Decrease in accrued purchases of property and equipment (61) (928)
Finance leases incurred   121
Increase in right-of-use assets and operating lease liabilities 63 8,226
Decrease in right-of-use assets for accrued rent   (497)
Increase in right-of-use assets for prepaid rent 3 14
Financed insurance premiums $ 433 $ 337