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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Cash flows from operating activities:    
Net loss $ (29,091) $ (13,196)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:    
Depreciation and amortization 12,863 17,174
Operating lease cost 1,066 1,186
Non-cash compensation 479 703
Deferred income tax expense 1 10
Bad debt expense   1,625
Change in other accrued long-term liabilities   (150)
Gain on disposal of assets (198) (240)
Remeasurement and other (278) 266
Change in operating assets and liabilities:    
(Increase) decrease in accounts receivable (1,272) 16,866
Decrease in prepaid expenses and other assets 1,397 3,301
Increase (decrease) in accounts payable 983 (2,276)
Decrease in accrued liabilities (453) (2,722)
Decrease in operating lease liabilities (1,112) (1,204)
Decrease in deferred revenue (435) (1,702)
Net cash (used in) provided by operating activities (16,050) 19,641
Cash flows from investing activities:    
Capital expenditures, net of non-cash capital expenditures summarized below (505) (2,847)
Proceeds from maturity of short-term investments 318 2,350
Acquisition of short-term investments   (583)
Proceeds from disposal of assets 451 542
Proceeds from notes receivable   26
Net cash provided by (used in) investing activities 264 (512)
Cash flows from financing activities:    
Proceeds from notes payable 787 6,374
Principal payments on notes payable (562) (8,512)
Principal payments on finance leases (55) (2,326)
Tax withholdings related to stock-based compensation awards (75) (70)
Net cash provided by (used in) financing activities 95 (4,534)
Effect of exchange rate changes on cash and cash equivalents and restricted cash 112 89
Net (decrease) increase in cash and cash equivalents and restricted cash (15,579) 14,684
Cash and cash equivalents and restricted cash at beginning of period 45,955 31,271
Cash and cash equivalents and restricted cash at end of period 30,376 45,955
Supplemental cash flow information:    
Cash paid for interest 20 92
Cash paid for income taxes 81 87
Cash received for income taxes 21 402
Non-cash operating, investing and financing activities:    
Decrease in accrued purchases of property and equipment   (61)
Increase in right-of-use assets and operating lease liabilities $ 1 64
Increase in right-of-use assets for prepaid rent   3
Financed insurance premiums   $ 434