Balance Sheets - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash	$ 55,796,378	$ 39,534,985
Accounts receivable, net		272,557
Prepaid expenses and other current assets	590,251	219,057
Total current assets	56,386,629	40,026,599
Property, plant and equipment, net	9,253,965	8,130,708
Operating lease right-of-use assets, net	2,823,430
Prepaid expenses and other assets	378,043	1,260,951
Total assets	68,842,067	49,418,258
Current liabilities:
Accounts payable	3,498,043	3,235,949
Accrued compensation	3,164,687	2,515,519
Accrued stock offering expenses	1,289,413
Other accrued expenses	1,525,919	1,459,182
Deferred rent		268,599
Current portion of operating lease liabilities	566,390
Current portion of finance lease liabilities	1,244,229	452,703
Current portion of long-term debt	5,585,637	316,906
Total current liabilities	16,874,318	8,248,858
Long-term operating lease liabilities	5,670,971
Long-term finance lease liabilities	1,056,747	376,082
Long-term deferred rent		2,406,084
Long-term deferred revenue		8,071,920
Long-term debt, noncurrent	10,292,484	11,627,643
Total liabilities	33,894,520	30,730,587
Commitments and contingencies (Note 9)
Stockholders’ equity:
Preferred stock — 10,000,000 shares authorized as of December 31, 2019 and December 31, 2018, 0 and 0 issued and outstanding as of December 31, 2019 and December 31, 2018, respectively
Common stock — $0.001 par value, 40,000,000 shares authorized as of December 31, 2019 and December 31, 2018, 28,231,267 and 15,519,469 issued and outstanding as of December 31, 2019 and December 31, 2018, respectively	28,231	15,520
Additional paid-in capital	250,158,766	185,726,048
Accumulated deficit	(215,239,450)	(167,053,897)
Total stockholders’ equity	34,947,547	18,687,671
Total liabilities and stockholders’ equity	$ 68,842,067	$ 49,418,258