Condensed Balance Sheets - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash	$ 14,762,198	$ 3,423,373
Accounts receivable, net	1,877,861	1,574,325
Inventories, net	577,284	587,222
Prepaid expenses and other current assets	270,248	425,961
Total current assets	17,487,591	6,010,881
Fixed assets, net	1,292,061	2,739,422
Lease right-of-use assets	3,112,280
Total assets	21,891,932	8,750,303
Current liabilities:
Accounts payable	2,262,214	2,039,718
Accrued liabilities	2,137,796	1,928,393
Current portion of equipment financings		641,536
Current portion of lease liabilities	2,025,594
Total current liabilities	6,425,604	4,609,647
Non-current portion of equipment financings		985,015
Non-current portion of lease liabilities	1,452,244
Non-current portion of deferred rent		113,122
Total liabilities	7,877,848	5,707,784
Commitments and contingencies (see Note 11)
Shareholders’ equity:
Preferred stock, $0.0001 par value, 5,000,000 authorized; 4,417 shares issued and outstanding at December 31, 2018; and 2,139 shares issued and outstanding at March 31, 2019.
Common stock, $0.0001 par value, 150,000,000 authorized; 4,629,174 issued and outstanding at December 31, 2018; 18,867,464 issued and outstanding at March 31, 2019.	1,887	463
Additional paid-in capital	240,486,305	223,499,634
Accumulated deficit	(226,474,108)	(220,457,578)
Total shareholders’ equity	14,014,084	3,042,519
Total liabilities and shareholders’ equity	$ 21,891,932	$ 8,750,303