Stockholders' Equity And Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2017

Summary Of Stock Option Activity

	Stock Options Outstanding
			Weighted	Weighted average
	Number		average	remaining life
	of shares		exercise price	(in years)
Balances — December 31, 2016	1,229	$	3.82	7.6
Options granted	1,068		27.02
Options exercised	(63)		2.98
Options canceled	(6)		4.00
Options expired	—		—
Balances — June 30, 2017	2,228	$	14.97	8.6
Exercisable	530

Total Stock-Based Compensation Expense

	Three-Month Periods Ended				Six-Month Periods Ended
	June 30,				June 30,
	2017		2016		2017		2016
General and administrative	$	2,305	$	147	$	2,509	$	295
Research and development		485		49		544		94
Total stock-based compensation expense	$	2,790	$	196	$	3,053	$	389

Schedule Of Fair Value Of Employee Stock Options

	Three-Month Periods Ended June 30,		Six-Month Periods Ended June 30,
	2017	2016	2017	2016
Expected term in years	5.3 - 6.1	6.1	5.3 - 6.1	6.1
Expected volatility	80%	80%	80%	80%
Risk-free interest rate	1.9 - 2.0%	1.31%	1.9 - 2.1%	1.39%
Dividend yield	—	—	—	—

2017 Employee Stock Purchase Plan [Member]

Schedule Of Fair Value Of Employee Stock Options

	Three-Month Periods Ended June 30,		Six-Month Periods Ended June 30,
	2017	2016	2017	2016
Expected term in years	0.8 - 1.3	N/A	0.8 - 1.3	N/A
Expected volatility	95%	N/A	95%	N/A
Risk-free interest rate	1.1%	N/A	1.1%	N/A
Dividend yield	—	N/A	—	N/A