CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Operating activities:
Net loss	$ (22,903)	$ (20,722)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	3,850	2,454
Stock-based compensation	4,474	3,568
Amortization of debt discount and debt issuance costs	640	1,238
Amortization of right-of-use assets	1,022	259
Provision for doubtful accounts		(5)
Provision for excess and obsolete inventory	2,096	1,722
Loss on disposal of instruments	369	32
Loss on impairment of intangible asset	150
Loss on fair value investments	149
Changes in operating assets and liabilities:
Accounts receivable, net	(1,891)	782
Inventories, net	(13,471)	(4,741)
Prepaid expenses and other current assets	1,367	(983)
Accounts payable	2,160	(2,643)
Accrued expenses and other current liabilities	2,958	3,414
Lease liability	31	(324)
Other long-term liabilities	395	(1,099)
Net cash used in operating activities	(18,604)	(17,048)
Investing activities:
Purchases of property and equipment	(15,202)	(2,629)
Cash paid for investment in EOS	(9,081)
Loss on forward contract settlement	(1,711)
Net cash used in investing activities	(25,994)	(2,629)
Financing activities:
Proceeds from public offering	131,838
Net cash (paid) received from common stock exercises	(1,048)	833
Borrowings under lines of credit		29,544
Repayments under lines of credit		(30,408)
Principal payments on capital lease obligations	(14)	(8)
Net cash provided by (used in) financing activities	130,776	(39)
Effect of exchange rate changes on cash	(2,806)	69
Net increase (decrease) in cash	83,372	(19,647)
Cash at beginning of period, including discontinued operations	107,765	47,113
Cash at end of period, including discontinued operations	191,137	27,466
Supplemental disclosure of cash flow information:
Cash paid for interest	1,783	1,646
Cash paid for income taxes	21	25
Supplemental disclosure of noncash investing activities:
Purchases of property and equipment in accounts payable	8,030	$ 1,297
Recognition of right-of-use asset	21,570
Recognition of lease liability	$ 21,505