CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities
Net loss	$ (13,900)	$ 67,967
Adjustments to reconcile net loss to net cash used in operating activities:
Gain on sale of the Core Business, net of tax	0	(69,072)
Depreciation and amortization	510	429
Provision for inventory obsolescence	115	0
Unrealized gain on foreign currency remeasurement	(12)	0
Loss on disposal of property and equipment	19	0
Stock based compensation	2,594	1,238
Change in fair value of derivative liabilities	0	(20)
Net, non cash lease expense	2
Realized and unrealized gains on short term investments	(164)	(47)
Provision for allowance for doubtful accounts	(94)	123
Benefit of deferred taxes	0	(368)
Changes in operating assets and liabilities:
Trade receivables	(2,580)	654
Prepaid expenses	(596)	(188)
Inventories	(2,463)	(1,706)
Deposits and other assets	(131)	(9)
Accounts payable	50	765
Accrued and other liabilities	1,556	(2,601)
Net cash used in operating activities	(15,094)	(2,835)
Cash flows from investing activities
Purchases of property and equipment	(1,076)	(203)
Purchases of marketable securities	(18,884)	(55,433)
Proceeds from maturities of marketable securities	80,726	0
Proceeds from the disposition of Core business	0	91,095
Net cash provided by investing activities	60,766	35,459
Cash flows from financing activities
Proceeds from stock options	154	65
Repayment of finance lease liabilities	(2)	0
Repayment of mortgage note payable	0	(2,694)
Net cash provided by (used in) financing activities	152	(2,629)
Effect of foreign currency translation on cash	(18)	0
Net change in cash, cash equivalents and restricted cash	45,806	29,995
Cash, cash equivalents and restricted cash, beginning of period	16,466	10,668
Cash, cash equivalents and restricted cash, end of period	62,272	40,663
Cash paid for:
Interest	0	102
Non cash financing activities:
Cashless exercise of stock options/warrants	$ 957	$ 3,133