Condensed Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 34,468	$ 38,165
Short-term investments	165,731	173,418
Prepaid clinical development costs	2,072	560
Other prepaid and current assets	1,653	1,434
Total current assets	203,924	213,577
Property and equipment, net	435	674
Intangible assets	56	56
Long-term investments	73,420	30,906
Total assets	277,835	245,213
Current liabilities:
Accounts payable	20,375	4,595
Current portion of long-term debt	1,045	1,709
Accrued clinical development costs	10,506	8,138
Other accrued liabilities	1,218	1,147
Total current liabilities	33,144	15,589
Long term debt, net of discount		1,022
Total liabilities	33,144	16,611
Commitments and contingencies (Note 5)
Stockholders' equity:
Preferred stock, $0.001 par value; 5,000,000 shares authorized and no shares issued or outstanding as of December 31, 2017 and December 31, 2016
Common stock, $0.001 par value; 120,000,000 shares authorized as of December 31, 2017 and December 31, 2016; 26,304,669 shares issued and outstanding at December 31, 2017; 22,555,413 shares issued and outstanding at December 31, 2016	26	23
Additional paid-in capital	641,801	457,951
Accumulated other comprehensive loss	(845)	(172)
Accumulated deficit	(396,291)	(229,200)
Total stockholders' equity	244,691	228,602
Total liabilities and stockholders' equity	$ 277,835	$ 245,213