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Stockholders' Equity - Summary of RSU Activity (Details) - 2013 Equity Incentive Plan - USD ($)		1 Months Ended	9 Months Ended
	Jan. 09, 2014	Sep. 30, 2019	Sep. 30, 2019
Restricted Stock Units information
Period for unrecognized compensation expense related to unvested options yet has not been recognized			2 years 8 months 12 days
Upon first anniversary of start date
Restricted Stock Units information
Percent of shares subject to option grant that will vest	25.00%
RSU [Member]
NUMBER OF SHARES
Unvested at beginning of period			4,833
Granted			332,106
Forfeited			0
Vested			(4,833)
Unvested at end of period		332,106	332,106
WEIGHTED-AVERAGE GRANT DATE FAIR VALUE
Unvested at beginning of period			$ 4.61
Granted			4.53
Forfeited			0.00
Vested			4.61
Unvested at end of period		$ 4.53	$ 4.53
RSU [Member] | Non-executive employees
Restricted Stock Units information
Vesting period		2 years
Unrecognized compensation expense related to unvested service RSUs		$ 1,477,649	$ 1,477,649
Period for unrecognized compensation expense related to unvested options yet has not been recognized			2 years
NUMBER OF SHARES
Granted		332,106
RSU [Member] | Non-executive employees | Upon first anniversary of start date
Restricted Stock Units information
Percent of shares subject to option grant that will vest		33.30%
RSU [Member] | Non-executive employees | On the second anniversary of the date of grant
Restricted Stock Units information
Percent of shares subject to option grant that will vest		66.70%

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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