Shareholders' Equity - Stock Options (Details) - USD ($)		6 Months Ended	132 Months Ended
	Mar. 11, 2016	Jun. 30, 2017	Jan. 31, 2016	Dec. 31, 2016	Feb. 28, 2005
Class of Stock [Line Items]
Common stock, shares granted and outstanding (in shares)		153,912		162,665
Unrecognized compensation cost related to unvested stock options		$ 467,882
Weighted-average remaining requisite service period		11 months
Unvested restricted stock units (in shares)		4,550
Restricted Stock Units (RSUs)
Class of Stock [Line Items]
Stock granted during period (in shares)	7,862
Price per share issued (in USD per share)	$ 13.2
Stock options, vesting period		2 years
The Plan | Qualified Incentive Stock Options
Class of Stock [Line Items]
Percentage of fair market value of common stock, percentage		100.00%
Percentage of common stock voting rights held, percentage		10.00%
Minimum percentage of fair market value of common stock, description		110.00%
The Plan | Qualified Incentive Stock Options | Vesting Period
Class of Stock [Line Items]
Option expiration period		10 years
The Plan | Qualified Incentive Stock Options | Vesting Period if Over 10% Voting Power
Class of Stock [Line Items]
Option expiration period		5 years
The Plan | Qualified Incentive Stock Options | Common Stock
Class of Stock [Line Items]
Common stock, shares authorized under the plan (in shares)			300,000		150,000
Common stock, shares granted and outstanding (in shares)		105,843
The Plan | Restricted Stock Units (RSUs)
Class of Stock [Line Items]
Stock granted during period (in shares)			6,500
The Plan | Restricted Stock Units (RSUs) | Board of Directors
Class of Stock [Line Items]
Stock granted during period (in shares)			1,000
The 2016 Plan
Class of Stock [Line Items]
Common stock, shares granted and outstanding (in shares)		48,065
Common stock reserved for future issuance (in shares)	250,000