Warrants - Additional Information (Details)		3 Months Ended
	Mar. 29, 2019 $ / shares	Mar. 31, 2019 USD ($) Tranche $ / shares shares	Jun. 15, 2015 $ / shares
Class Of Warrant Or Right [Line Items]
Number of tranches | Tranche		2
First tranche
Class Of Warrant Or Right [Line Items]
Common stock warrants outstanding | shares		370,370
Exercise price of common stock warrants			$ 2.70
Common stock warrants life			7 years
Common stock warrants expiration date		Jun. 15, 2022
Warrant
Class Of Warrant Or Right [Line Items]
Intrinsic value of common stock warrants | $		$ 1,863,000
Fair value of common stock	$ 7.73
Second tranche
Class Of Warrant Or Right [Line Items]
Common stock warrants outstanding | shares		882,071
Exercise price of common stock warrants		$ 9.38
Common stock warrants life		5 years
Common stock warrants expiration date		Dec. 26, 2022