Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current assets:
Cash and restricted cash	$ 12,001	$ 13,610
Receivables, net	2,982	3,615
Unbilled receivables	2,719	2,093
Deferred costs	847	341
Prepaid expenses and other current assets	986	733
Total current assets	19,535	20,392
Long-term assets:
Property and equipment, net	142	150
Restricted cash, long-term	408	408
Deferred costs, long-term	156	112
Right-of-use assets	2,646	2,793
Total assets	22,887	23,855
Current liabilities:
Accounts payable	1,734	1,385
Accrued compensation and benefits	2,816	3,640
Deferred revenue	6,710	5,803
Current portion of lease liabilities	533	519
Other accrued liabilities	2,739	2,060
Warrant liabilities	627	691
Total current liabilities	15,159	14,098
Long-term liabilities:
Long-term debt, net	33,250	31,597
Long-term lease liabilities	1,931	2,069
Total liabilities	50,340	47,764
Stockholders' deficit:
Preferred stock, $0.0001 par value; 50,000,000 shares authorized; no shares issued and outstanding	0	0
Common stock, $0.0001 par value; 500,000,000 shares authorized; 16,876,581 and 16,616,165 shares issued and outstanding at March 31, 2020 and December 31, 2019, respectively	2	2
Additional paid-in capital	311,454	307,403
Accumulated deficit	(338,909)	(331,314)
Total stockholders' deficit	(27,453)	(23,909)
Total liabilities and stockholders' deficit	$ 22,887	$ 23,855