Redeemable Convertible Preferred Stock (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2019

Dec. 31, 2018

Temporary Equity Disclosure [Abstract]

Redeemable Convertible Preferred Stock Issued and Outstanding

The Company has the following redeemable convertible preferred stock issued and outstanding at December 31, 2018:

	December 31, 2018
	Shares Authorized	Shares Issued and Outstanding	Per share Preference		Preferential Liquidation Value (in thousands)		Carrying Value (in thousands)
Series
Series A	1,629,629	1,629,626	$	2.70	$	4,400	$	4,369
Series A-1	1,111,111	1,111,109	$	3.38	3,755		3,723
Series B	6,264,470	6,264,463	$	6.11	38,276		38,014
Series C	15,064,405	12,227,992	$	6.11	74,713		59,129
	24,069,615	21,233,190			$	121,144	$	105,235

The Company has the following redeemable convertible preferred stock issued and outstanding at March 31, 2019:

	March 31, 2019
	Shares Authorized	Shares Issued and Outstanding	Per share Preference		Preferential Liquidation Value (in thousands)		Carrying Value (in thousands)
Series
Series A	1,629,629	1,629,626	$	2.70	$	4,400	$	4,369
Series A-1	1,111,111	1,111,109	$	3.38	3,755		3,723
Series B	6,264,470	6,264,463	$	6.11	38,276		38,014
Series C	15,064,405	12,232,907	$	6.11	74,743		59,159
	24,069,615	21,238,105			$	121,174	$	105,265

The Company has the following redeemable convertible preferred stock issued and outstanding at December 31, 2017 and 2018:

	December 31, 2017 and 2018
	Shares Authorized	Shares Issued and Outstanding	Per share Preference		Preferential Liquidation Value (in thousands)		Carrying Value (in thousands)
Series
Series A	1,629,629	1,629,626	$	2.70	$	4,400	$	4,369
Series A-1	1,111,111	1,111,109	$	3.38	3,755		3,723
Series B	6,264,470	6,264,463	$	6.11	38,276		38,014
Series C	15,064,405	12,227,992	$	6.11	74,713		59,129
	24,069,615	21,233,190			$	121,144	$	105,235