Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019
Operating activities:
Net loss	$ (13,996)	$ (11,643)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	900	693
Amortization expense - right-of-use assets - operating and finance leases	1,336	1,486
Gain on disposal of property and equipment	0	(1)
Stock-based compensation	4,108	4,051
Unrealized loss on investment in equity securities	0	168
Changes in operating assets and liabilities:
Accounts receivable, net	(4,972)	(262)
Contract assets	1,027	35
Unbilled receivables	(2,313)	365
Inventories	(315)	(131)
Prepaid expenses and other current assets	(611)	(882)
Other non-current assets	(213)	59
Accounts payable	(19)	(1,625)
Accrued compensation	(24)	(721)
Other accrued liabilities	1,863	402
Other long-term liabilities	(1,270)	(715)
Deferred revenue	3,001	812
Net cash used in operating activities	(11,498)	(7,909)
Investing activities:
Purchase of property and equipment	(1,490)	(1,258)
Proceeds from disposal of property and equipment	0	1
Investment in equity securities	(1,000)	0
Net cash used in investing activities	(2,490)	(1,257)
Financing activities:
Proceeds from exercises of stock options	197	2,843
Proceeds from issuance of common stock in connection with private placement	0	50,000
Costs incurred in connection with private placement	0	(74)
Payments of lease obligations - Finance leases	(60)	(119)
Taxes paid related to net share settlement of equity awards	(1,040)	(2,799)
Net cash provided by (used in) financing activities	(903)	49,851
Net increase (decrease) in cash, cash equivalents and restricted cash	(14,891)	40,685
Cash, cash equivalents and restricted cash at the beginning of the period	92,221	54,485
Cash, cash equivalents and restricted cash at the end of the period	77,330	95,170
Supplemental disclosure of cash flow information
Interest paid	4	9
Income taxes paid	5	0
Purchase of property and equipment recorded in accounts payable and accrued expenses	90	773
Total cash, cash equivalents and restricted cash at the end of the period	$ 77,330	$ 95,170

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