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Equity
 9 Months Ended
Sep. 30, 2019
Equity [Abstract]  
Equity
Equity

The tables below present changes in stockholders' equity for the three and nine months ended September 30, 2019 and 2018.

 
Common Stock
 
Additional Paid-in Capital
 
Accumulated Deficit
 
Other Comprehensive Income
 
Total Stockholders' Equity
 
Shares
 
Amount
 
Balances at June 30, 2019
81,046,524

 
$
8,105

 
$
220,770,338

 
$
(117,323,976
)
 
$
—

 
$
103,454,467

Net loss
—

 
—

 
—

 
(1,205,827
)
 
—

 
(1,205,827
)
Issuance of common stock
53,332

 
5

 
(5
)
 
—

 
—

 
—

Payment of common stock tendered for employee stock-based compensation tax obligations
(25,576
)
 
(3
)
 
(143,217
)
 
—

 
—

 
(143,220
)
Stock-based compensation
—

 
—

 
761,096

 
—

 
—

 
761,096

Balances at September 30, 2019
81,074,280

 
$
8,107

 
$
221,388,212

 
$
(118,529,803
)
 
$
—

 
$
102,866,516


 
Common Stock
 
Additional Paid-in Capital
 
Accumulated Deficit
 
Other Comprehensive Income
 
Total Stockholders' Equity
 
Shares
 
Amount
 
Balances at December 31, 2018
80,763,350

 
$
8,076

 
$
218,697,872

 
$
(115,791,261
)
 
$
—

 
$
102,914,687

Net loss
—

 
—

 
—

 
(2,738,542
)
 
—

 
(2,738,542
)
 Issuance of common stock upon exercise of stock options
9,769

 
1

 
(1
)
 
—

 
—

 
—

 Issuance of common stock upon vesting of RSUs and exercise of stock-settled appreciation rights
121,771

 
12

 
(12
)
 
—

 
—

 
—

Issuance of common stock upon exercise of warrants
159,782

 
16

 
1,172,785

 
—

 
—

 
1,172,801

Issuance of common stock
53,332

 
5

 
(5
)
 
—

 
—

 
—

Payment of common stock tendered for employee stock-based compensation tax obligations
(33,724
)
 
(3
)
 
(199,807
)
 
—

 
—

 
(199,810
)
Stock-based compensation
—

 
—

 
1,717,380

 
—

 
—

 
1,717,380

Balances at September 30, 2019
81,074,280

 
$
8,107

 
$
221,388,212

 
$
(118,529,803
)
 
$
—

 
$
102,866,516



 
Common Stock
 
Additional Paid-in Capital
 
Accumulated Deficit
 
Other Comprehensive Income
 
Total Stockholders' Deficiency
 
Shares
 
Amount
 
Balances at June 30, 2018
79,160,058

 
$
7,916

 
$
214,906,962

 
$
(556,232,608
)
 
$
—

 
$
(341,317,730
)
Net loss
—

 
—

 
—

 
388,050,413

 
—

 
388,050,413

 Issuance of common stock upon exercise of stock options
395,663

 
39

 
252,640

 
—

 
—

 
252,679

 Issuance of common stock upon vesting of RSUs and exercise of stock-settled appreciation rights
227,287

 
23

 
(23
)
 
—

 
—

 
—

Issuance of common stock upon exercise of warrants
760,625

 
76

 
6,007,771

 
—

 
—

 
6,007,847

 Payment of common stock tendered for employee stock-based compensation tax obligations
(223,098
)
 
(22
)
 
(1,695,940
)
 
—

 
—

 
(1,695,962
)
Stock-based compensation
—

 
—

 
1,176,558

 
—

 
—

 
1,176,558

Balances at September 30, 2018
80,320,535

 
$
8,032

 
$
220,647,968

 
$
(168,182,195
)
 
$
—

 
$
52,473,805



 
Common Stock
 
Additional Paid-in Capital
 
Accumulated Deficit
 
Other Comprehensive Income
 
Total Stockholders' Deficiency
 
Shares
 
Amount
 
Balances at December 31, 2017
79,039,000

 
$
7,904

 
$
214,229,581

 
$
(537,375,776
)
 
$
—

 
$
(323,138,291
)
Net income
—

 
—

 
—

 
369,416,894

 
—

 
369,416,894

 Issuance of common stock upon exercise of stock options
408,698

 
41

 
252,638

 
—

 
—

 
252,679

 Issuance of common stock upon vesting of RSUs and exercise of stock-settled appreciation rights
337,084

 
33

 
(33
)
 
—

 
—

 
—

Issuance of common stock upon exercise of warrants
760,625

 
76

 
6,007,771

 
—

 
—

 
6,007,847

 Payment of common stock tendered for employee stock-based compensation tax obligations
(224,872
)
 
(22
)
 
(1,708,268
)
 
—

 
—

 
(1,708,290
)
Cumulative effect of accounting change
—

 
—

 
—

 
(223,313
)
 
—

 
(223,313
)
Stock-based compensation
—

 
—

 
1,866,279

 
—

 
—

 
1,866,279

Balances at September 30, 2018
80,320,535

 
$
8,032

 
$
220,647,968

 
$
(168,182,195
)
 
$
—

 
$
52,473,805