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Stockholders' Equity - Summary of 2001 Plan for Restricted Stock Grants (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total compensation cost attributable to shares awarded	$ 3,100,000	$ 2,800,000	$ 1,800,000
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares awarded (in shares)	44,424	36,799	59,240
Average grant-date market price per share (in usd per share)	$ 11.48	$ 9.60	$ 4.22
Total compensation cost attributable to shares awarded	$ 509,988	$ 353,000	$ 250,000
Compensation cost recognized related to current and prior year awards	$ 518,164	$ 283,307	$ 249,995
Restricted Stock | Non Employee Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares awarded (in shares)	7,404	5,257	11,848
Total compensation cost attributable to shares awarded	$ 63,745
Restricted Stock | Additional Non-employee Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares awarded (in shares)	4,866
Average grant-date market price per share (in usd per share)	$ 13.10

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