Condensed Consolidated Balance Sheets - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 13,576,445	$ 22,397,812
Short-term investments available-for-sale, at fair value	16,181,828	6,298,075
Accounts receivable	1,421,780	1,588,767
Inventory, net of allowance of $18,780 at June 30, 2021 and $26,052 at December 31, 2020	2,318,130	1,492,126
Prepaid expenses and other	2,448,678	1,094,273
Total current assets	35,946,861	32,871,053
Operating lease right-of-use assets	246,321	1,009,097
Property and equipment, net	1,120,966	1,227,402
Other non-current assets	5,743	90,356
Total assets	37,319,891	35,197,908
Current liabilities:
Accounts payable	1,682,290	1,348,762
Accrued liabilities	1,317,690	1,459,878
Contract liabilities - current	208,736	185,083
NuvoGen obligation - current	486,058	512,729
Current portion of long-term debt	3,164,413	3,022,139
Operating lease liabilities - current	263,731	685,220
Other current liabilities	18,953	22,563
Total current liabilities	7,141,871	7,236,374
NuvoGen obligation - non-current, net of discount	4,244,939	4,479,396
Long-term debt, net of current portion, discount and debt issuance costs	7,443,275	8,568,308
Operating lease liabilities - non-current		368,682
Other non-current liabilities	48,992	60,488
Total liabilities	18,879,077	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 June 30, 2021 and December 31, 2020	24	24
Common stock, $0.001 par value; 26,666,667 shares authorized at June 30, 2021 and December 31, 2020, 7,411,474 shares issued and outstanding at June 30, 2021 and 5,199,997 shares issued and outstanding at December 31, 2020	7,411	5,200
Additional paid-in-capital	217,080,903	205,661,999
Accumulated other comprehensive income	3,596	5,298
Accumulated deficit	(198,651,120)	(191,187,861)
Total stockholders’ equity	18,440,814	14,484,660
Total liabilities and stockholders' equity	$ 37,319,891	$ 35,197,908