Consolidated Balance Sheets - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 20,897,000	$ 24,237,000
Accounts receivable	0	1,660,000
Other receivables	413,000	438,000
Contract costs	1,537,000
Prepaid expenses and other current assets	2,990,000	2,012,000
Total current assets	25,837,000	28,347,000
Property and equipment, net	1,006,000	1,271,000
Intangible assets, net	32,000	38,000
Equity method investment	9,000	960,000
Contract costs	526,000
Other assets	557,000	995,000
Total assets	27,967,000	31,611,000
Current liabilities:
Accounts payable	1,755,000	2,331,000
Accrued liabilities	2,974,000	2,944,000
Deferred revenue, current	14,602,000	22,000
Total current liabilities	19,331,000	5,297,000
Deferred revenue	5,000,000
Total liabilities	24,331,000	5,297,000
Commitments and contingencies (Note 13)
Stockholders' equity:
Common stock (par value $0.0001; 100,000,000 shares authorized; shares issued and outstanding: 8,918,461 and 8,104,757, as of December 31, 2019 and December 31, 2018, respectively )	1,000	1,000
Additional paid-in capital	104,404,000	97,401,000
Accumulated deficit	(100,769,000)	(71,088,000)
Total stockholders' equity	3,636,000	26,314,000
Total liabilities and stockholders' equity	$ 27,967,000	$ 31,611,000