Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 52,051	$ 112,637
Short-term investment securities	26,284	27,798
Prepaid research and development	7,737	8,105
Other current assets	1,944	611
Total current assets	88,016	149,151
Restricted cash	1,252	1,251
Leasehold interest, net	2,168	2,129
Equipment, net	320	282
Right of use asset	9,294	9,402
Goodwill	799	799
Total assets	101,849	163,014
Current liabilities:
Accounts payable and accrued expenses	30,903	30,041
Other current liabilities	29,245	48,994
Lease liability - current portion	1,602	1,616
Accrued compensation	1,368	3,798
Total current liabilities	63,118	84,449
Deferred revenue, net of current portion	724	762
Long-term debt	29,201	28,970
Lease liability - non-current	10,159	10,218
Total liabilities	103,202	124,399
Commitments and contingencies
Stockholders' (deficit) equity:
Common stock, $0.001 par value per share (150,000,000 shares authorized, 110,209,293 and 109,425,243 shares issued, 110,167,984 and 109,383,934 shares outstanding at March 31, 2020 and December 31, 2019, respectively)	110	109
Additional paid-in capital	751,103	739,956
Treasury stock, at cost, 41,309 shares at March 31, 2020 and December 31, 2019	(234)	(234)
Accumulated deficit	(752,332)	(701,216)
Total stockholders' (deficit) equity	(1,353)	38,615
Total liabilities and stockholders' (deficit) equity	$ 101,849	$ 163,014