Balance Sheets - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Current assets:
Cash	$ 2,146,611	$ 4,609,332
Accounts receivable, net	1,193,426	128,969
Inventories, net	498,702	549,045
Prepaid expenses and other current assets	416,600	484,649
Total current assets	4,255,339	5,771,995
Fixed assets, net	3,123,567	1,806,331
Total assets	7,378,906	7,578,326
Current liabilities:
Accounts payable	1,269,953	960,486
Accrued liabilities	1,752,363	1,160,036
Supplier financings	61,226	75,691
Current portion of equipment financings	408,992	262,674
Current portion of credit facility, net	1,168,811	1,934,665
Total current liabilities	4,661,345	4,393,552
Non-current portion of equipment financings	1,150,063	778,643
Non-current portion of credit facility, net		1,123,001
Non-current portion of interest payable		227,177
Non-current portion of deferred rent	271,464	397,292
Total liabilities	6,082,872	6,919,665
Commitments and contingencies (see Note 16)
Shareholders’ equity:
Preferred stock, $0.0001 par value, 5,000,000 shares authorized; no shares issued and outstanding at December 31, 2016 and 2017.
Common stock, $0.0001 par value, 150,000,000 shares authorized; 17,499,397 shares issued and outstanding at December 31, 2016; 35,183,743 shares issued and outstanding at December 31, 2017.	3,518	1,750
Additional paid-in capital	196,542,123	174,292,781
Accumulated deficit	(195,249,607)	(173,635,870)
Total shareholders’ equity	1,296,034	658,661
Total liabilities and shareholders’ equity	$ 7,378,906	$ 7,578,326