Consolidated Balance Sheets - USD ($)
|
Dec. 31, 2015 |
Dec. 31, 2014 |
| Current assets: |
|
|
| Cash and cash equivalents |
$ 20,007,659
|
$ 27,666,055
|
| Marketable investment securities |
24,375,168
|
0
|
| Accrued interest income |
144,536
|
0
|
| Prepaid and other current assets |
350,160
|
229,912
|
| Total current assets |
44,877,523
|
27,895,967
|
| Property and equipment, net of accumulated depreciation of $1,060,750 and $1,034,029, respectively |
75,750
|
73,782
|
| Long-term marketable investment securities |
400,252
|
0
|
| Other assets |
23,753
|
23,753
|
| Total assets |
45,377,278
|
27,993,502
|
| Current liabilities: |
|
|
| Accounts payable |
507,067
|
306,276
|
| Accrued expenses |
2,884,794
|
1,327,256
|
| Total current liabilities |
3,391,861
|
1,633,532
|
| Total liabilities |
$ 3,391,861
|
$ 1,633,532
|
| Commitments and contingencies (notes 7 and 10) |
|
|
| Stockholders' equity: |
|
|
| Preferred stock, par value $0.0001 per share, 10,000,000 shares authorized; zero issued and outstanding |
$ 0
|
$ 0
|
| Common stock, par value $0.0001 per share, 100,000,000 shares authorized; 18,250,456 and 12,800,382 issued and 18,244,746 and 12,794,672 outstanding |
1,825
|
1,280
|
| Additional paid-in capital |
128,502,659
|
94,636,479
|
| Treasury stock at cost, 5,710 shares |
(40,712)
|
(40,712)
|
| Accumulated other comprehensive loss |
(32,900)
|
0
|
| Accumulated deficit |
(86,445,455)
|
(68,237,077)
|
| Total stockholders' equity |
41,985,417
|
26,359,970
|
| Total liabilities and stockholders' equity |
$ 45,377,278
|
$ 27,993,502
|