Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash flows used in operating activities
Net loss	$ (7,595)	$ (2,921)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	2,272	1,024
Depreciation	23	38
Amortization	347	100
Change in fair value of warrant liability	(64)	91
Deferred rent	0	(26)
Changes in operating assets and liabilities:
Accounts payable	349	322
Leases liabilities	(88)	0
Other accrued liabilities	(145)	(261)
Prepaid and other current assets	(612)	(6)
Deferred revenue	907	(501)
Receivables	633	(2,219)
Unbilled receivables	(626)	0
Net cash used in operating activities	(4,599)	(4,359)
Cash flows used in investing activities
Purchase of property and equipment	(14)	0
Net cash used in investing activities	(14)	0
Cash flows provided by financing activities
Debt issuance costs	0	(105)
Proceeds from warrant exercise	20	100
Proceeds from options exercise	1,567	0
Capital lease obligations	(36)	(2)
Net cash provided by financing activities	3,004	2,493
Net increase in cash and restricted cash	(1,609)	(1,866)
Cash and restricted cash at beginning of period	14,018	3,570
Cash and restricted cash at end of period	12,409	1,704
Supplemental disclosure of cash flow information:
Interest paid	0	192
Non cash financing and investing activities:
Reclassification of warrant liability to equity upon adoption of ASU 2017-11	0	86
Warrants issued in connection with revolving loan	0	461
Stock options exercise in transit	192
Revolving Loan
Cash flows provided by financing activities
Proceeds from debt	0	2,500
2024 Notes
Cash flows provided by financing activities
Proceeds from debt	$ 1,453	$ 0