Condensed Consolidated Balance Sheet - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 16,496	$ 3,939
Marketable securities	9,176
Prepaid expenses and other current assets	593	1,025
Inventory	329
Total current assets	26,594	4,964
Deposits and other assets	644	217
Property and equipment, net	776	311
Total assets	28,014	5,492
Current liabilities:
Accounts payable	5,348	1,252
Accrued expenses and other current liabilities	3,578	3,694
Note payable, current portion	1,667	2,389
Total current liabilities	10,593	7,335
Notes payable, net of discount	12,983	7,499
Accrued interest	127	327
Other liabilities	86	28
Total liabilities	23,789	15,189
Commitments and contingencies (Note 6)
Stockholders' equity (deficit):
Preferred stock, $0.001 par value per share; 5,000,000 and 0 shares authorized, no shares issued and outstanding as of June 30, 2016 and December 31, 2015	0	0
Common stock, $0.001 par value per share; 250,000,000 shares authorized, 93,390,172 and 75,760,061 shares issued and outstanding as of September 30, 2016 and December 31, 2015	93	76
Additional paid-in capital	198,889	151,019
Accumulated deficit	(194,757)	(160,792)
Total stockholders' equity (deficit)	4,225	(9,697)
Total liabilities and stockholders' equity (deficit)	$ 28,014	$ 5,492