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Stock-Based Plans - Narrative (Details)		1 Months Ended			9 Months Ended
	May 31, 2019	Jun. 30, 2020 shares	May 31, 2020 offering_period shares	Jun. 30, 2019 USD ($) shares	Sep. 30, 2020 USD ($)	Jan. 31, 2017 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of voting power which impacts the term of equity incentive plan					10.00%
ESPP, offering period	6 months	6 months		12 months
Purchase price of common stock, percent	85.00%	85.00%
ESPP, number of six-month offering periods | offering_period			2
2011 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards authorized for issuance (shares) | shares		1,400,000		5,000,000.0
2017 Inducement Award Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards authorized for issuance (shares) | shares						2,000,000
Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation cost related to stock-based compensation arrangements					$ 1,100,000
Weighted average remaining contractual terms					1 year 4 months 24 days
2017 Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incremental compensation cost					$ 300,000
Additional awards authorized for issuance (shares) | shares		3,000,000.0
Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period					3 years
Award vesting percentage			50.00%
Number of months over which options vest ratably					36 months
Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period					1 year
Award vesting percentage			25.00%
Number of months over which options vest ratably					48 months
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period					4 years
Rate at which outstanding options vest on the first anniversary of the option grant date					25.00%
Awards authorized for issuance (shares) | shares			1,800,000
Total unrecognized compensation cost related to stock-based compensation arrangements					$ 22,000,000.0
Weighted average remaining contractual terms					2 years 9 months 18 days
Restricted Stock Units (RSUs) | Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Rate at which outstanding options vest on the first anniversary of the option grant date					25.00%
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period					10 years
Stock option grants exercise price minimum percentage on fair market value					100.00%
Stock options held by owners of more than 10% of common stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period					5 years
Stock option grants exercise price minimum percentage on fair market value					110.00%
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period					3 years
Total unrecognized compensation cost related to stock-based compensation arrangements					$ 4,600,000
Weighted average remaining contractual terms					1 year 8 months 12 days
Performance Shares | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of performance period					0.00%
Performance Shares | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of performance period					200.00%
Employee Stock | 2017 Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum employee subscription rate	10.00%	10.00%		15.00%
Maximum employee purchase amount				$ 25,000

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