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Employee Benefit Plan
 12 Months Ended
Dec. 31, 2018
Postemployment Benefits [Abstract]  
Employee Benefit Plan
14.
 
Employee Benefit Plan
The Company sponsors a qualified 401(k) retirement plan under which employees are allowed to contribute certain percentages of their pay, up to the maximum allowed under Section 401(k) of the IIRC. The Company may make contributions to this plan at its discretion. The Company contributed approximately $329 thousand, $90 thousand, and $75 thousand to this plan during the years ended December 31, 2018, 2017, and 2016, respectively.