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Stockholders' Equity - Incentive Plans (Details) - USD ($)			3 Months Ended	6 Months Ended
	Jan. 01, 2019	Jan. 09, 2014	Jun. 30, 2019	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Maximum
Incentive plans
Expiration period				10 years
2003 Stock Incentive Plan
Incentive plans
Period from date of termination that any vested options shall expire				60 days
Expiration period				10 years
Intrinsic value of options exercised				$ 129,250	$ 512,313
Cash proceeds from exercise of stock options				$ 12,320	37,600
Options exercised				11,000
2003 Stock Incentive Plan | Upon first anniversary of start date
Incentive plans
Percent of shares subject to option grant that will vest				25.00%
2003 Stock Incentive Plan | Each month after the first anniversary
Incentive plans
Percent of shares subject to option grant that will vest				2.083%
2013 Equity Incentive Plan
Incentive plans
Period from date of termination that any vested options shall expire		90 days
Expiration period		10 years
Unrecognized compensation expense related to unvested options			$ 14,641,879	$ 14,641,879
Period for unrecognized compensation expense related to unvested options yet has not been recognized				2 years 9 months 18 days
Intrinsic value of options exercised				$ 97,429	721,337
Cash proceeds from exercise of stock options				$ 94,001	353,850
Options exercised				16,606
Fair value of shares vested				$ 4,395,888	$ 2,204,404
2013 Equity Incentive Plan | Upon first anniversary of start date
Incentive plans
Percent of shares subject to option grant that will vest		25.00%
2013 Equity Incentive Plan | Each month after the first anniversary
Incentive plans
Percent of shares subject to option grant that will vest		2.083%
Common Stock
Incentive plans
Options exercised			13,021	32,439
Common Stock | 2013 Equity Incentive Plan
Authorized shares
Common stock authorized under 2013 plan	5,162,816	1,000,000
Automatic increase in number of shares reserved for issuance as a percentage of the total common stock outstanding at the end of the prior year		3.00%				3.00%
Maximum number of shares that may be issued pursuant to exercise of incentive stock		20,000,000
Increase in number of shares of common stock	1,294,822

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