Condensed Consolidated Balance Sheets - USD ($)	Jun. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 15,294,526	$ 16,522,729
Accounts receivable, net	4,983,510	4,514,333
Inventory	3,022,090	1,068,557
Prepaid expenses and other current assets	631,853	919,500
Total current assets	23,931,979	23,025,119
Property and equipment, net	1,278,889	1,777,302
Total assets	25,210,868	24,802,421
Current liabilities:
Accounts payable	3,617,836	1,351,736
Accrued expenses	2,702,015	2,900,129
Deferred revenue	421,342	270,998
Line of credit	799,815	0
Total current liabilities	7,541,008	4,522,863
Long-term debt	18,621,696	9,029,374
Long-term deferred revenue	219,202	304,467
Other non-current liabilities	173,772	808,366
Total liabilities	26,555,678	14,665,070
Commitments and contingencies (Note 9)
Stockholders’ equity (deficit):
Common stock, $0.0001 par value, 200,000,000 and 200,000,000 shares authorized at June 30, 2019 and December 31, 2018, respectively; 10,897,522 and 10,055,072 shares issued and outstanding at June 30, 2019 and December 31, 2018, respectively	1,088	1,004
Additional paid-in capital	86,932,839	82,898,775
Accumulated deficit	(88,278,737)	(72,762,428)
Total stockholders’ equity (deficit)	(1,344,810)	10,137,351
Total liabilities and stockholders’ equity (deficit)	$ 25,210,868	$ 24,802,421