Condensed Consolidated Balance Sheets - USD ($)	Mar. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 14,614,427	$ 9,599,950
Short-term investments available-for-sale, at fair value	6,948,584	12,343,456
Accounts receivable, net of allowance of $20,315 at March 31, 2022 and December 31, 2021	749,220	2,092,466
Inventory, net of allowance of $79,339 at March 31, 2022 and $25,306 at December 31, 2021	2,022,478	1,987,753
Prepaid expenses and other	1,082,135	1,163,339
Total current assets	25,416,844	27,186,964
Operating lease right-of-use assets	1,245,045	1,345,361
Property and equipment, net	941,809	1,118,886
Other non-current assets	860,604	809,476
Total assets	28,464,302	30,460,687
Current liabilities:
Accounts payable	1,317,009	1,649,440
Accrued liabilities	1,024,984	2,022,569
Current portion of long-term debt	5,000,000	5,167,586
NuvoGen obligation - current	548,301	548,301
Operating lease liabilities - current	423,111	413,865
Other current liabilities	181,088	141,749
Total current liabilities	8,494,493	9,943,510
NuvoGen obligation - non-current, net of discount	3,725,273	3,900,880
Long-term debt, net of current portion, discount and debt issuance costs	4,046,356	5,178,629
Other non-current liabilities	929,706	1,037,844
Total liabilities	17,195,828	20,060,863
Commitments and Contingencies (Note 15)
Stockholders’ equity:
Series A convertible preferred stock, $0.001 par value; no shares authorized, issued and outstanding at March 31, 2022; 23,770 shares authorized, issued and outstanding at December 31, 2021		24
Common stock, $0.001 par value; 26,666,667 shares authorized at March 31, 2022 and December 31, 2021, 8,583,253 shares issued and outstanding at March 31, 2022 and 7,588,085 shares issued and outstanding at December 31, 2021	8,583	7,588
Additional paid-in-capital	226,090,840	218,723,349
Accumulated other comprehensive income (loss)	(399)	1,894
Accumulated deficit	(214,830,550)	(208,333,031)
Total stockholders’ equity	11,268,474	10,399,824
Total liabilities and stockholders' equity	$ 28,464,302	$ 30,460,687