Condensed Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 10,320	$ 13,935
Contract and other receivables	2,792	26
Prepaid materials, net	3,826	4,194
Prepaid expenses and other current assets	801	1,140
Total current assets	17,739	19,295
Property and equipment, net	1,598	7,806
Intangibles, net	407	500
Other assets	133	326
Total assets	19,877	27,927
Current liabilities:
Accounts payable	2,650	1,714
Accrued liabilities	1,745	1,625
Accrued compensation	1,915	1,601
Current portion of term loan, less debt issuance costs	15,225	16,575
Current portion of contract liabilities	60	2,572
Other current liabilities	3,245	2,559
Total current liabilities	24,840	26,646
Contract liabilities, less current portion	0	6
Deferred rent, less current portion	0	6,820
Other long-term liabilities	1,106	309
Total liabilities	25,946	33,781
Stockholders’ deficit:
Common stock, $0.001 par value; 200,000,000 shares authorized, 10,817,916 and 8,818,019 shares issued and outstanding at March 31, 2019 (unaudited) and December 31, 2018, respectively	11	9
Additional paid-in capital	389,903	386,860
Accumulated deficit	(395,983)	(392,723)
Total stockholders’ deficit	(6,069)	(5,854)
Total liabilities and stockholders’ deficit	$ 19,877	$ 27,927