Balance Sheet Components (Tables)

12 Months Ended

Dec. 31, 2018

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Schedule of Prepayments and Other Current Assets

Prepaid Expenses and Other Current Assets

	December 31,
	2018
	(in thousands)
Accrued interest on short-term marketable securities	$	3,108
Prepaid insurance		2,376
Prepaid research and development expenses		2,356
Other prepaid and current assets		758
Total prepaid expenses and other current assets	$	8,598

Schedule of Property and Equipment, Net

Property and Equipment, Net

	December 31,
	2018
	(in thousands)
Laboratory equipment	$	5,534
Leasehold improvements		15
Computers equipment and purchased software		1,327
Furniture and fixtures		64
Construction in progress		2,703
Total		9,643
Less: accumulated depreciation		(1,048	)
Total property and equipment, net	$	8,595

Schedule of Intangible Assets, Net

Intangible Assets, Net

	December 31, 2018
	Cost		Accumulated Amortization			Carrying Value
	(in thousands)
Assembled workforce	$	1,206	$	(452	)	$	754

Schedule of Accrued Liabilities

Accrued Liabilities

Accrued liabilities consist of the following:

	December 31, 2018		December 31, 2017
	(in thousands)
Accrued research and development expenses	$	7,808	$	—
Unvested shares liabilities		4,590	—
Accrued compensation and related benefits		4,111	—
Other		612		2
Total accrued and other current liabilities	$	17,121	$	2