CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash flows from operating activities
Net loss	$ (13,844)	$ (12,964)
Adjustments to reconcile net loss to net cash used in operating activities
Stock-based compensation expense	1,447	1,903
Depreciation and amortization	1,097	621
Provision for bad debts	101	13
Provision for inventories	23	2
Loss on disposal of property and equipment	3	23
Amortization of discount on debt	63	44
Changes in operating assets and liabilities, net of acquisition:
Accounts receivable	(3,875)	847
Inventories	(12)	1,780
Prepaid expenses and other assets	33	197
Accounts payable	1,310	(1,094)
Contract liabilities	38	22
Accrued expenses and other current liabilities	2,894	(1,225)
Net cash used in operating activities	(10,722)	(9,831)
Cash flows from investing activities
Purchases of property and equipment	(1,558)	(1,128)
Acquisition of business, net of cash acquired		(1,560)
Net cash used in investing activities	(1,558)	(2,688)
Cash flows from financing activities
Short-term line of credit	995	837
Proceeds from exercise of stock options	40
Proceeds on loans		10,500
Debt issuance costs		(322)
Net cash provided by financing activities	1,035	11,015
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(17)
Net decrease in cash, cash equivalents and restricted cash	(11,262)	(1,504)
Cash, cash equivalents and restricted cash
Beginning of period	73,507	60,022
End of period	62,245	58,518
Supplemental disclosures of cash flow information
Interest paid during the period	1,202	939
Property and equipment purchases in accounts payable and accrued expenses	$ 36	42
Issuance of warrants in conjunction with debt draw down		$ 293