Balance Sheets - USD ($)	Sep. 30, 2019	Dec. 31, 2018
Current assets:
Cash	$ 39,304,564	$ 39,534,985
Accounts receivable - trade and other	945,662	272,557
Prepaid expenses and other current assets	486,471	219,057
Total current assets	40,736,697	40,026,599
Property, plant and equipment, net	8,090,272	8,130,708
Operating lease right-of-use assets, net	2,836,829
Prepaid expenses and other assets	574,857	1,260,951
Total assets	52,238,655	49,418,258
Current liabilities:
Accounts payable	4,543,940	3,235,949
Accrued expenses	1,531,133	1,459,182
Accrued compensation	2,263,083	2,515,519
Deferred rent		268,599
Current portion of operating lease liabilities	543,677
Current portion of finance lease liabilities	1,020,546
Current portion of finance lease liabilities		452,703
Current portion of long-term debt	4,293,611	316,906
Total current liabilities	14,195,990	8,248,858
Long-term operating lease liabilities	5,822,244
Long-term finance lease liabilities	1,106,083
Long-term finance lease liabilities		376,082
Long-term deferred rent		2,406,084
Long-term deferred revenue		8,071,920
Long-term debt	11,565,636	11,627,643
Total liabilities	32,689,953	30,730,587
Commitments and contingencies (Note 8)
Stockholders’ equity:
Preferred stock — 10,000,000 shares authorized as of September 30, 2019 and December 31, 2018, 0 and 0 issued and outstanding as of September 30, 2019 and December 31, 2018, respectively
Common stock — $0.001 par value, 40,000,000 shares authorized as of September 30, 2019 and December 31, 2018, 18,656,686 and 15,519,469 issued and outstanding as of September 30, 2019 and December 31, 2018, respectively	18,656	15,520
Additional paid-in capital	220,277,054	185,726,048
Accumulated deficit	(200,747,008)	(167,053,897)
Total stockholders’ equity	19,548,702	18,687,671
Total liabilities and stockholders’ equity	$ 52,238,655	$ 49,418,258