Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash flows from operating activities
Net loss	$ (23,259)	$ (20,217)
Adjustments to reconcile net loss to net cash used in operating activities:
Non-cash other income/expense, net	673	(27)
Non-cash interest income	15	(13)
Non-cash interest expense	1	227
Loss on extinguishment of debt	2,757
Depreciation and amortization expense	103	125
Amortization of right-of-use assets	15	109
Stock-based compensation	1,765	1,907
Other, net	(22)	8
Changes in operating assets and liabilities:
Increase in long-term receivables		(10)
Increase in accounts receivable, net and other receivables and prepaid expenses	(2,326)	(2,650)
Increase in inventory	(3,542)
Increase/(decrease) in accounts payable	(2,537)	4,302
Decrease in accrued expenses and other liabilities	(1,784)	(4,374)
Increase/(decrease) in other non-current liabilities	54	(30)
Increase/(decrease) in income tax liabilities	(21)	18
Net cash used in operating activities	(28,108)	(20,625)
Cash flows from investing activities
Purchases of plant and equipment and intangible assets	(72)	(42)
Changes in restricted cash	52
Net cash used in investing activities	(20)	(42)
Cash flows from financing activities
Proceeds from at-the-market facility	154	9,978
Repayments of long-term borrowings	(30,000)
Equity transaction costs	(373)	(299)
Net cash provided by (used in) financing activities	(30,219)	9,679
Effects of foreign currency translation on cash and cash equivalents	(682)	27
Net decrease in cash, cash equivalents and restricted cash	(59,029)	(10,961)
Cash, cash equivalents and restricted cash at beginning of period	86,411	102,003
Cash, cash equivalents and restricted cash at end of period	27,382	91,042
Supplemental disclosure of cash flow information:
Interest paid	1,022	483
Proceeds from at-the-market facility in accounts receivable, net and other receivables	164
Equity transaction costs included in accounts payable and accrued expenses	$ 217	$ 20