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	$ (4,821)	$ (13,273)
Adjustments to reconcile net income to net cash from operating activities:
Share-based compensation	3,349	3,014
Depreciation	1,506	1,695
Amortization of intangible assets	271	233
Amortization of deferred financing costs and debt discount	668	0
Non-cash lease expenses	239	269
Loss on fixed asset disposal	0	1
Impairment of intangible assets	0	1,258
Increase (decrease) in cash resulting from changes in:
Accounts receivable	395	0
Inventory	(143)	(442)
Prepaid expenses	1,430	2,053
Income tax receivable	(10,711)	(12)
Other assets	812	(1,612)
Accounts payable	1,046	(4,173)
Accrued compensation	(4,186)	(7,501)
Accrued expenses	(2,845)	3,895
Income taxes	0	0
Other liabilities	709	(665)
Cash flows used in operating activities	(12,281)	(15,260)
Cash flows from investing activities:
Purchases of equipment	(1,011)	(648)
Principal payments from note receivable	0	389
Patent application costs	(75)	(174)
Cash flows used in investing activities	(1,086)	(433)
Cash flows from financing activities:
Proceeds from exercise of stock options	298	0
Stock repurchased for tax withholdings on vesting of restricted stock	(1,538)	(1,044)
Repayment of term loan	(937)	0
Cash flows used in financing activities	(2,177)	(1,044)
Net change in cash	(15,544)	(16,737)
Cash and cash equivalents, beginning of period	69,069	45,118
Cash and cash equivalents, end of period	$ 53,525	$ 28,381