Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 8,772	$ 7,081
Marketable securities		900
Prepaid expenses and other current assets	881	194
Total current assets	9,653	8,175
Property and equipment, net	5,173	2,723
Other assets, long-term	188
Restricted cash	137	137
Total assets	15,151	11,035
Current liabilities:
Accounts payable	2,207	776
Accrued expenses	1,672	2,705
Current portion of deferred revenue	7,500
Current portion of deferred rent	40	35
Current portion of deferred lease incentive	238	111
Current portion of equipment loan		178
Total current liabilities	11,657	3,805
Accrued expenses due to Intrexon Corporation	3,040	3,040
Deferred revenue, net of current portion	2,500
Deferred rent, net of current portion	317	280
Deferred lease incentive, net of current portion	1,144	499
Warrant liability	19,931	14,679
Total liabilities	38,589	22,303
Commitments and contingencies (Note 5)
Convertible preferred stock and stockholders’ equity (deficit):
Convertible preferred stock, $0.01 par value; 30,000 shares authorized, 1,401.7208 and 4,605.6533 shares issued and outstanding at June 30, 2018 and December 31, 2017, respectively
Common stock, $0.01 par value; 100,000,000 shares authorized, 28,791,504 and 24,571,029 shares issued and outstanding at June 30, 2018 and December 31, 2017, respectively	186	159
Additional paid-in capital	203,173	196,760
Accumulated deficit	(226,797)	(208,187)
Total stockholders’ equity (deficit)	(23,438)	(11,268)
Total liabilities and stockholders’ equity (deficit)	$ 15,151	$ 11,035