CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash flows from operating activities:
Net loss	$ (13,287)	$ (30,483)
Adjustments to reconcile net loss to net cash flows used in operating activities:
Share-based compensation	7,783	6,513
Depreciation	2,928	3,340
Amortization of intangible assets	542	500
Amortization of deferred financing costs	1,441	116
Bad debt expense	234	0
Non-cash lease expenses	486	492
Reserve for inventory obsolescence	(217)	500
Loss on fixed asset disposal	1	313
Impairment of intangible assets	0	1,258
Increase (decrease) in cash resulting from changes in:
Accounts receivable	1,996	0
Inventory	(1,243)	534
Prepaid expenses	3,819	4,125
Income tax receivable	(10,682)	(80)
Other current assets	821	(1,527)
Accounts payable	3,236	(4,072)
Accrued compensation	(518)	(3,814)
Accrued expenses	(12,109)	10,975
Other liabilities	(609)	(1,820)
Net cash flows used in operating activities	(15,378)	(13,130)
Cash flows from investing activities:
Purchases of equipment	(1,421)	(899)
Principal payments from note receivable	0	389
Patent application costs	(151)	(253)
Net cash flows used in investing activities	(1,572)	(763)
Cash flows from financing activities:
Proceeds from term loan	10,000	72,750
Repayment of term loan	(11,875)	0
Deferred financing cost	(23)	(6,045)
Stock repurchased for tax withholdings on vesting of restricted stock	(2,330)	(1,109)
Proceeds from exercise of stock options	298	108
Net cash flows (used in) provided by financing activities	(3,930)	65,704
Net change in cash	(20,880)	51,811
Cash and cash equivalents, beginning of period	69,069	45,118
Cash and cash equivalents, end of period	$ 48,189	$ 96,929