Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 18,881	$ 10,738
Short-term investments	44,798	0
Contracts receivable	5,234	7,230
Prepaids and other current assets	520	1,873
Total current assets	69,433	19,841
Property and equipment, net	725	743
Restricted cash	127	127
Deposit and other assets	37	47
Total assets	70,322	20,758
Current liabilities:
Accounts payable	2,122	2,923
Accrued liabilities	3,266	3,004
Notes payable, current portion	0	4,989
Other current liabilities	128	73
Total current liabilities	5,516	10,989
Deferred rent	193	125
Notes payable, noncurrent portion	0	1,698
Other long-term liabilities	0	244
Total liabilities	5,709	13,056
Commitments and contingencies (Note 7)
Convertible preferred stock, $0.001 par value, zero shares and 132,202,910 shares authorized at December 31, 2014 and 2013, respectively; zero shares and 9,796,342 shares issued and outstanding at December 31, 2014 and 2013, respectively; liquidation value of $132,809 at December 31, 2013	0	132,278
Stockholders’ equity (deficit):
Common stock, $0.001 par value, 290,000,000 and 163,000,000 shares authorized at December 31, 2014 and 2013, respectively; 17,907,135 and 392,844 shares issued and outstanding at December 31, 2014 and 2013, respectively	18	0
Preferred stock, $0.001 par value, 10,000,000 shares and zero shares authorized at December 31, 2014 and December 31, 2013, respectively; zero shares issued and outstanding at December 31, 2014 and December 31, 2013	0	0
Additional paid-in capital	213,527	4,148
Accumulated deficit	(148,900)	(128,724)
Accumulated other comprehensive loss	(32)	0
Total stockholders’ equity (deficit)	64,613	(124,576)
Total liabilities, convertible preferred stock, and stockholders’ equity (deficit)	$ 70,322	$ 20,758