Consolidated Balance Sheets - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 9,599,950	$ 22,397,812
Short-term investments available-for-sale, at fair value	12,343,456	6,298,075
Accounts receivable, net of allowance of $20,315 at December 31, 2021 and $0 at December 31, 2020	2,092,466	1,588,767
Inventory, net of allowance of $25,306 at December 31, 2021 and $26,052 at December 31, 2020 – current	1,987,753	1,492,126
Prepaid expenses and other	1,163,339	1,094,273
Total current assets	27,186,964	32,871,053
Operating lease right-of-use assets	1,345,361	1,009,097
Property and equipment, net	1,118,886	1,227,402
Other non-current assets	809,476	90,356
Total assets	30,460,687	35,197,908
Current liabilities:
Accounts payable	1,649,440	1,348,762
Accrued liabilities	2,022,569	1,459,878
Contract liabilities – current	124,941	185,083
NuvoGen obligation – current	548,301	512,729
Current portion of long-term debt	5,167,586	3,022,139
Operating lease liabilities – current	413,865	685,220
Other current liabilities	16,808	22,563
Total current liabilities	9,943,510	7,236,374
NuvoGen obligation - non-current, net of discount	3,900,880	4,479,396
Long-term debt, net of current portion, discount and debt issuance costs	5,178,629	8,568,308
Operating lease liabilities - non-current	949,461	368,682
Other non-current liabilities	88,383	60,488
Total liabilities	20,060,863	20,713,248
Commitments and Contingencies (Note 15)
Stockholders’ equity:
Series A convertible preferred stock, $0.001 par value; 23,770 shares authorized, issued and outstanding at December 31, 2021 and 2020	24	24
Common stock, $0.001 par value; 26,666,667 shares authorized at December 31, 2021 and 2020, 7,588,085 shares issued and outstanding at December 31, 2021 and 5,199,997 shares issued and outstanding at December 31, 2020	7,588	5,200
Additional paid-in-capital	218,723,349	205,661,999
Accumulated other comprehensive income	1,894	5,298
Accumulated deficit	(208,333,031)	(191,187,861)
Total stockholders’ equity	10,399,824	14,484,660
Total liabilities and stockholders' equity	$ 30,460,687	$ 35,197,908