Condensed Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 47,140	$ 77,336
Short-term investments	162,961	134,925
Prepaid clinical development costs	1,732	888
Other prepaid and current assets	1,634	1,245
Total current assets	213,467	214,394
Property and equipment, net	622	807
Intangible assets	56	56
Long-term investments	49,646	80,315
Total assets	263,791	295,572
Current liabilities:
Accounts payable	1,783	707
Current portion of long-term debt	1,682	1,604
Accrued clinical development costs	2,447	2,191
Other accrued liabilities	2,248	1,123
Total current liabilities	8,160	5,625
Long-term debt, net of discount and issuance costs	1,451	2,688
Total liabilities	9,611	8,313
Stockholders' equity:
Preferred stock, $0.001 par value; 5,000,000 shares authorized as of September 30, 2016 and December 31, 2015; no shares issued or outstanding at September 30, 2016 and December 31, 2015
Common stock, $0.001 par value; 120,000,000 shares authorized as of September 30, 2016 and December 31, 2015; 22,553,851 shares issued and outstanding at September 30, 2016 and 22,518,907 shares issued and 22,516,508 outstanding at December 31, 2015	23	23
Additional paid-in capital	454,379	441,940
Accumulated other comprehensive income ( loss)	22	(482)
Accumulated deficit	(200,244)	(154,222)
Total stockholders' equity	254,180	287,259
Total liabilities and stockholders' equity	$ 263,791	$ 295,572