Summary of Significant Accounting Policies - Additional Information (Details)		1 Months Ended	3 Months Ended				12 Months Ended
	Mar. 08, 2018 shares	Mar. 31, 2019 USD ($)	Mar. 31, 2019 USD ($) shares	Sep. 30, 2018 shares	Jun. 30, 2018 shares	Mar. 31, 2018 USD ($) shares	Dec. 31, 2019 USD ($) customer shares	Dec. 31, 2018 USD ($) customer shares	Sep. 30, 2019 USD ($)
Significant Accounting Policies [Line Items]
Accounts receivable payment terms							30 days
Accounts receivable related to products and services							$ 16,150,000	$ 15,095,000
Operating lease, ROU asset		$ 2,400,000	$ 2,400,000				1,860,000
Operating lease liability		2,900,000	$ 2,900,000				2,239,000
Removal of deferred rent									$ 600,000
Goodwill and intangible asset impairment charge							0
Impairment charges of Long-lived assets disposition							0	0
Impairment charges of Long-lived assets held for use							0	0
Sales, general and administrative							101,714,000	72,640,000
Preferred stock convertible to common stock | shares						14,300,000
Recognition of beneficial conversion feature series B preferred stock						$ 13,500,000		13,488,000
Recognition of beneficial conversion feature SafeOp convertible notes		$ 200,000
Product Shipment
Significant Accounting Policies [Line Items]
Sales, general and administrative							$ 4,000,000	$ 2,500,000
SafeOp Surgical, Inc.
Significant Accounting Policies [Line Items]
Preferred stock convertible to common stock | shares	987,578
SafeOp Surgical, Inc. | Common Stock
Significant Accounting Policies [Line Items]
Stock issued for acquisition | shares	2,975,209		886,843	174,302	115,621		886,843	443,421
Fair value, inputs, level 3
Significant Accounting Policies [Line Items]
Vesting period							4 years
Fair value of the cash settled award							$ 1,700
Minimum
Significant Accounting Policies [Line Items]
Estimated useful lives of property and equipment							3 years
Minimum | Acquired Technology, Customer Relationships, Manufacturing Know-how, Licensed Technology, Supply Agreements and Certain Trade Names and Trademarks
Significant Accounting Policies [Line Items]
Intangible assets, amortization period							1 year
Maximum
Significant Accounting Policies [Line Items]
Estimated useful lives of property and equipment							7 years
Maximum | Acquired Technology, Customer Relationships, Manufacturing Know-how, Licensed Technology, Supply Agreements and Certain Trade Names and Trademarks
Significant Accounting Policies [Line Items]
Intangible assets, amortization period							20 years
Sales | Customer Concentration Risk
Significant Accounting Policies [Line Items]
Concentration risk, number of customers | customer							0	0
Accounts Receivable | Customer Concentration Risk
Significant Accounting Policies [Line Items]
Concentration risk, number of customers | customer							0	0