CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Cash flows from operating activities:
Net loss	$ (13,196)	$ (15,213)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	17,174	21,826
Operating lease cost	1,186	1,201
Non-cash compensation	703	1,206
Deferred income tax expense (benefit)	10	(23)
Bad debt expense	1,625
Change in other accrued long-term liabilities	(150)
Gain on disposal of assets	(240)	(86)
Remeasurement and other	266	(139)
Change in operating assets and liabilities:
Decrease in accounts receivable	16,866	1,118
Decrease in prepaid expenses and other assets	3,301	6,983
Decrease in accounts payable	(2,276)	(579)
(Decrease) increase in accrued liabilities	(2,722)	1,356
Decrease in operating lease liabilities	(1,204)	(1,150)
Decrease in deferred revenue	(1,702)	(7,020)
Net cash provided by operating activities	19,641	9,480
Cash flows from investing activities:
Capital expenditures, net of non-cash capital expenditures summarized below	(2,847)	(4,396)
Proceeds from maturity of short-term investments	2,350	33,075
Acquisition of short-term investments	(583)	(24,842)
Proceeds from disposal of assets	542	297
Proceeds from notes receivable	26	51
Net cash (used in) provided by investing activities	(512)	4,185
Cash flows from financing activities:
Proceeds from notes payable	6,374
Principal payments on notes payable	(8,512)	(8,165)
Principal payments on finance leases	(2,326)	(2,855)
Tax withholdings related to stock-based compensation awards	(70)	(236)
Net cash used in financing activities	(4,534)	(11,256)
Effect of exchange rate changes on cash and cash equivalents and restricted cash	89	133
Net increase in cash and cash equivalents and restricted cash	14,684	2,542
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	45,955	31,271
Supplemental cash flow information:
Cash paid for interest	92	440
Cash paid for income taxes	87	40
Cash received for income taxes	402	55
Non-cash operating, investing and financing activities:
Decrease in accrued purchases of property and equipment	(61)	(927)
Finance leases incurred		121
Increase in right-of-use assets and operating lease liabilities	64	8,252
Decrease in right-of-use assets for accrued rent		(497)
Increase in right-of-use assets for prepaid rent	3	14
Financed insurance premiums	$ 434	$ 2,256