Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	$ (34,293)	$ (39,219)
Adjustments to reconcile net income (loss) to net cash from (used in) operating activities:
Depreciation and amortization of property and equipment	18,799	24,279
Loss (gain) on disposal of property and equipment		273
Loss (gain) on build-to-suit accounting derecognition	(4,936)
Loss on impairment	7,662	1,261
Changes in reserves and allowances	(235)	(1,102)
Share-based compensation	6,338	6,669
Non-cash interest expense	546	372
Changes in operating assets and liabilities:
Accounts receivable	136	(81)
Inventories	6,326	3,340
Prepaid expenses and other current assets	(13,966)	2,843
Accounts payable	3,388	5,967
Accrued expenses and other current liabilities	4,249	(2,997)
Deferred revenue	(347)	(4,361)
Other noncurrent assets and liabilities	2,281	(2,816)
Net cash from (used in) operating activities	(4,052)	(5,572)
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment	(4,777)	(3,900)
Proceeds from sale of property and equipment	165	378
Net cash from (used in) investing activities	(4,612)	(3,522)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of common stock, net of offering costs	32,867
Repayment of debt	(10,846)
Payments of debt issuance costs		(24)
Proceeds from exercise of stock options	477	54
Principal payments on capital lease obligations, pre adoption	(166)	(185)
Net cash from (used in) financing activities	22,332	(155)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS AND RESTRICTED CASH	13,668	(9,249)
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH - Beginning of period	46,443	97,307
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH - End of period	60,111	88,058
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid for income taxes, net of refunds	60	60
Cash paid for interest	4,991	7,388
SUPPLEMENTAL DISCLOSURES OF NON-CASH INVESTING AND FINANCING INFORMATION:
Acquisition (disposal) of property and equipment financed under capital lease	565
Non-cash additions to property and equipment	261	339
Purchases of property and equipment in Accounts payable and Accrued expenses and other current liabilities	$ 119	$ 221