CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash flows from operating activities:
Net loss	$ (11,015)	$ (7,060)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	1,925	1,075
Depreciation and amortization	997	646
Amortization of intangible assets	1,788	1,788
Amortization of debt discount and issuance costs	675	401
Deferred income taxes	(82)	(75)
Changes in fair value of earn-out liability	(911)	(320)
Changes in assets and liabilities:
Accounts receivable	2,418	(9)
Inventories	(2,187)	1,992
Prepaid expenses and other current assets	(384)	(301)
Other non-current assets	(316)	176
Accounts payable	2,112	545
Accrued compensation and benefits	(3,338)	57
Accrued expenses and other current liabilities	(2,262)	756
Price adjustments and other revenue reserves	(187)	1
Other non-current liabilities	(365)	(303)
Net cash used in operating activities	(11,132)	(631)
Cash flows from investing activities:
Acquisition of property and equipment	(1,114)	(600)
Investment in unconsolidated affiliate	(112)	(4)
Net cash used in investing activities	(1,226)	(604)
Cash flows from financing activities:
Proceeds from exercise of stock options and employee stock purchase plan	1,949	570
Tax withholdings related to net share settlement of restricted stock units	(246)	(85)
Payments on term loan		(437)
Net cash provided by financing activities	1,703	48
Effect of exchange rates on cash, cash equivalents and restricted cash	(598)	203
Net decrease in cash, cash equivalents and restricted cash	(11,253)	(984)
Cash, cash equivalents and restricted cash - beginning of year	21,722	9,088
Cash, cash equivalents and restricted cash - end of year	10,469	8,104
Supplemental disclosures of other cash flow information:
Cash paid for interest expense	1,531	981
Supplemental disclosures of non-cash investing and financing information:
Purchase of property and equipment included in accounts payable	$ 711	$ 165