Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Current assets
Cash	$ 44,709	$ 12,524
Deferred equity issuance costs		578
Investments	5,060	4,997
Prepaid expenses and other current assets	1,043	1,096
Total current assets	50,812	19,195
Property, plant and equipment, net	67,602	56,233
Other assets	349	349
Total assets	118,763	75,777
Current liabilities
Accounts payable	1,820	1,167
Share-based compensation liability	993
Accrued liabilities and other current liabilities	4,105	3,767
Total current liabilities	6,918	4,934
Non-current compensation liabilities	2,015	2,745
Non-current share-based compensation liability	1,312
Total liabilities	10,245	7,679
Commitments and contingencies (Note 9)
Stockholders’ equity
Preferred stock, $0.0001 par value, 1.0 million shares authorized, none issued
Common stock	11	10
Additional paid-in-capital	147,814	88,406
Accumulated deficit	(39,289)	(20,291)
Accumulated other comprehensive loss	(18)	(27)
Total stockholders’ equity	108,518	68,098
Total liabilities and stockholders’ equity	$ 118,763	$ 75,777