CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities
Net loss	$ (10,407)	$ (13,844)
Adjustments to reconcile net loss to net cash used in operating activities
Stock-based compensation expense	2,685	1,447
Depreciation and amortization	1,574	1,097
Provision for bad debts	(156)	101
Provision for inventory valuation	(12)	23
Non-cash lease expense	422	256
Change in fair value of contingent consideration	202
Loss on disposal of property and equipment	23	3
Amortization of discount on debt	32	63
Deferred income taxes	3
Changes in operating assets and liabilities, net of acquisition:
Accounts receivable	9,987	(3,875)
Inventories	(7,042)	(12)
Prepaid expenses and other assets	(1,651)	33
Accounts payable	870	1,310
Contract liabilities	(1,730)	143
Accrued expenses and other current liabilities	(14,338)	2,789
Operating lease liabilities, current and long-term	(424)	(256)
Net cash used in operating activities	(19,962)	(10,722)
Cash flows from investing activities
Purchases of property and equipment	(2,256)	(1,558)
Net cash used in investing activities	(2,256)	(1,558)
Cash flows from financing activities
Proceeds from short-term line of credit		995
Proceeds from exercise of stock options	761	40
Net cash provided by financing activities	761	1,035
Effect of exchange rate changes on cash, cash equivalents and restricted cash	2	(17)
Net decrease in cash, cash equivalents and restricted cash	(21,455)	(11,262)
Cash, cash equivalents and restricted cash
Beginning of period	115,536	73,507
End of period	94,081	62,245
Supplemental disclosures of cash flow information
Interest paid during the period	639	1,202
Property and equipment purchases in accounts payable and accrued expenses	263	36
Issuance of common stock upon vesting of restricted stock units	$ 47	$ 58