Summary of Business and Significant Accounting Policies - Additional Information (Details) shares in Thousands, $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Oct. 29, 2020 USD ($) shares	Sep. 30, 2020 USD ($) Employee shares	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) Reportingunit shares	Sep. 30, 2019 USD ($) shares	Dec. 31, 2019 USD ($)		May 07, 2020 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Net loss		$ (4,072)	$ (3,273)	$ (11,524)	$ (11,882)	$ (12,408)
Accumulated deficit		(288,636)		(288,636)		(277,112)	[1]
Cash, cash equivalents and restricted cash		$ 8,950		$ 8,950
Common stock sold under agreement | shares		134		134	570
Net proceeds from common stock sold		$ 179		$ 179	$ 1,504
Allowance for doubtful accounts		1,176		1,176		1,559
Allowance for potential customer revenue credits		436		$ 436		319
Number of reporting unit | Reportingunit				1
Impairment of goodwill						$ 1,910
Goodwill		$ 0		$ 0
Accounting Standards Update 2018-13 [Member]
Summary Of Significant Accounting Policies [Line Items]
Accounting standards update, adopted [true false]		true		true
Accounting standards update, adoption date		Jan. 01, 2020		Jan. 01, 2020
Accounting standards update, immaterial effect [true false]		true		true
Accounting Standards Update 2018-15 [Member]
Summary Of Significant Accounting Policies [Line Items]
Accounting standards update, adopted [true false]		true		true
Accounting standards update, adoption date		Jan. 01, 2020		Jan. 01, 2020
Accounting standards update, immaterial effect [true false]		true		true
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Aggregate offering price		$ 50,000		$ 50,000
Subsequent Event [Member]
Summary Of Significant Accounting Policies [Line Items]
Common stock sold under agreement | shares	1,900
Net proceeds from common stock sold	$ 5,994
JMP Securities [Member] | Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Aggregate offering price		$ 13,000		$ 13,000
Paycheck Protection Program [Member] | Harvest Small Business Finance, LLC [Member]
Summary Of Significant Accounting Policies [Line Items]
Aggregate principal amount of the loan								$ 3,320
Debt instrument expected loan forgiveness								$ 2,800
Restructuring and Reduction in Force Plan [Member] | 2020 Restructuring Plan [Member]
Summary Of Significant Accounting Policies [Line Items]
Expected reduction of workforce | Employee		60

[1] Derived from the Company’s audited consolidated financial statements as of December 31, 2019.