Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 20,858	$ 20,079
Marketable securities		51,199
Restricted cash		584
Prepaid expenses and other current assets	1,540	4,240
Total current assets	22,398	76,102
Property and equipment, net		2,269
Equity method investment		7,428
Other assets	2,443	2,744
Total assets	24,841	88,543
Current liabilities:
Accounts payable, accrued expenses and other	4,683	13,677
Deferred rent		1,118
Other current liabilities	56
Total current liabilities	4,739	14,795
Note payable, net of discount and current portion		14,873
Other long-term liabilities		56
Total liabilities	4,739	29,724
Commitments and contingencies
Stockholders’ equity:
Preferred stock, $0.01 par value: 10,000 shares authorized at September 30, 2019 and December 31, 2018; no shares issued or outstanding at September 30, 2019 or December 31, 2018
Common stock, $0.01 par value: 30,000 shares authorized at September 30, 2019 and December 31, 2018; 13,363 and 13,343 shares issued and outstanding at September 30, 2019 and December 31, 2018, respectively	1,334	1,334
Additional paid-in capital	562,638	580,771
Accumulated other comprehensive loss		(9)
Accumulated deficit	(543,870)	(523,277)
Total stockholders’ equity	20,102	58,819
Total liabilities and stockholders’ equity	$ 24,841	$ 88,543