CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($)	Sep. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 7,225,000	$ 8,067,000
Marketable securities, available-for-sale	18,473,000	0
Prepaid expenses and other current assets	5,034,000	204,000
Total current assets	30,732,000	8,271,000
Property and equipment, net	20,000	37,000
Operating lease right-of-use asset	176,000
Intangible assets	441,000	441,000
Total assets	31,369,000	8,749,000
Current liabilities:
Accounts payable	1,291,000	4,067,000
Accrued liabilities	3,475,000	3,272,000
Lease liability, current portion	75,000
Deferred revenue, current portion	2,464,000	8,117,000
Note payable	0	4,639,000
Total current liabilities	7,305,000	20,095,000
Contingent consideration	145,000	145,000
Lease liability, net of current portion	94,000
Warrant liability	0	242,000
Deferred revenue, net of current portion	0	1,595,000
Research and development funding liability	5,600,000	0
Total liabilities	13,144,000	22,077,000
Redeemable convertible preferred stock (Series A, B, C and C-1), $0.01 par value, 5,000,000 and 4,182,943 shares authorized at September 30, 2019 and December 31, 2018, respectively; 0 and 1,256,466 shares issued and outstanding at September 30, 2019 and December 31, 2018, respectively; aggregate liquidation preference of $0 and $46,985 at September 30, 2019 and December 31, 2018, respectively	0	58,290,000
Commitments and contingencies (Note 8)
Stockholders’ equity (deficit):
Common stock, $0.01 par value, 50,000,000 and 8,000,000 shares authorized at September 30, 2019 and December 31, 2018, respectively; 7,810,680 and 589,001 issued and outstanding at September 30, 2019 and December 31, 2018, respectively	78,000	6,000
Additional paid-in capital	92,276,000	0
Accumulated other comprehensive loss	(11,000)	0
Accumulated deficit	(74,118,000)	(71,624,000)
Total stockholders’ equity (deficit)	18,225,000	(71,618,000)
Total liabilities, redeemable convertible preferred stock, and stockholders’ equity (deficit)	$ 31,369,000	$ 8,749,000