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Stockholders' equity (Narrative) (Details) - USD ($)					1 Months Ended				3 Months Ended	9 Months Ended		12 Months Ended
Stockholders' equity (Narrative) (Details) - USD ($)	Mar. 12, 2021	Mar. 09, 2021	Feb. 11, 2021	Apr. 02, 2020	Oct. 31, 2021	Nov. 25, 2020	Nov. 23, 2020	Oct. 28, 2019	Sep. 30, 2021	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Feb. 11, 2020	Jan. 17, 2018	Jan. 16, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares authorized									50,000,000	50,000,000		50,000,000		50,000,000	200,000,000
Common stock, shares issued									38,270,250	38,270,250		25,085,534
Common stock, shares outstanding									38,270,250	38,270,250		25,085,534
Preferred stock, shares authorized									10,000,000	10,000,000		10,000,000
Preferred stock, shares issued									0	0		0
Preferred stock, shares outstanding									0	0		0
Proceeds from issuance of common stock, net of issuance costs											$ 14,982,663
Proceeds from issuance of warrant										$ 255,751
Stock options, granted									60,000	415,000
Stock options, forfeited									252,625	351,001
Stock options, expired									199	672
Stock options, outstanding									1,727,849	1,727,849
Share-based compensation, tax benefit from compensation expense										$ 1,300,000
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options, granted										360,000
Stock options, forfeited									43,500	64,967
Share-based compensation arrangement by share-based payment award, equity instruments other than options, vested in period										3,768
Share-based compensation arrangement by share-based payment award, equity instruments other than options, non-vested, outstanding									299,383	299,383
2015 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, number of shares authorized									2,710	2,710
Share-based compensation arrangement by share-based payment award, description										the number of shares that have been authorized for issuance under the 2015 Plan will be automatically increased on the first day of each fiscal year beginning on January 1, 2016 and ending on (and including) January 1, 2025, in an amount equal to the lesser of (1) 4% of the outstanding shares of common stock on the last day of the immediately preceding fiscal year, or (2) another lesser amount determined by the Company’s Board of Directors.
Share-based compensation arrangement by share-based payment award, number of shares available for grant									647,968	647,968
Share-based compensation arrangement by share-based payment award, common stock percentage										4.00%
2015 Plan [Member] \| Board of Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, number of shares available for grant									1,003,421	1,003,421
2020 Stock Options Plan [Member] \| ExecutiveOfficers And Non-Employee Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares available for future issuance amount											$ 1,300,000
Stock options, granted											1,300,000
2016 Stock Option Plan [Member] \| Replacement Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant date fair value of options awarded										$ 1.68
Number of share options granted										134,371
Curetis GmbH [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Acquisition of shares				2,028,208
2020 ATM Offering [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock issued during period, shares, new issues					680,000
Proceeds from issuance of common stock, net of issuance costs					$ 1,500,000
Gross proceeds from sale of common stock					$ 1,548,000
Healthcare-focused U.S. Institutional Investor [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock issued during period, shares, new issues			2,784,184
Proceeds from issuance of common stock, net of issuance costs			$ 23,500,000
Gross proceeds from sale of common stock			$ 25,000,000.0
Shares issued, price per share			$ 3.00
Class of warrant or right, exercise price of warrants or rights			$ 0.01
Warrants exercisable period			6 months
Warrants expiry period			5 years 6 months
Common Stock [Member] \| H.C. Wainwright & Co., LLC [Member] \| 2020 ATM Offering [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock issued during period, shares, new issues												7,521,610
Proceeds from issuance of common stock, net of issuance costs										$ 1,500,000		$ 15,800,000
Gross proceeds from sale of common stock										1,548,000		16,700,000
Remaining availability under market offering										5,400,000
Common Stock [Member] \| H.C. Wainwright & Co., LLC [Member] \| 2020 ATM Offering [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares available for future issuance amount													$ 22,100,000
Pre Funded Warrant [Member] \| Healthcare-focused U.S. Institutional Investor [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock issued during period, shares, new issues			5,549,149
Shares issued, price per share			$ 2.99
Class of warrant or right, exercise price of warrants or rights			$ 3.55
Warrants exercised			4,166,666
Warrants [Member] \| Holder pursuant to company issued to Holder securities [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Proceeds from issuance of warrant							$ 9,650,000
Warrants exercisable period		5 years
Non-cash warrant expense							$ 7,800,000
New Warrants [Member] \| Holder pursuant to company issued to Holder securities [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Purchase of new warrants	$ 255,751
Shares issued, price per share		$ 0.65
Class of warrant or right, exercise price of warrants or rights		$ 3.56
Issuance of common stock warrants to purchase		3,147,700
October 2019 Public Offering [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock issued during period, shares, new issues								2,590,170
Shares issued, price per share								$ 2.00
Warrants exercisable period								5 years
October 2019 Public Offering [Member] \| Common Warrants [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Proceeds from issuance of common stock, net of issuance costs										$ 10,000		$ 8,700,000
Warrants exercised										5,000		4,341,000
October 2019 Public Offering [Member] \| Pre-funded Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock issued during period, shares, new issues								2,109,830
Shares issued, price per share								$ 1.99
Gross proceeds from sale of common stock and warrants								$ 9,400,000
Net proceeds from sale of common stock and warrants								$ 8,300,000
2020 PIPE [Member] \| Healthcare-focused U.S. Institutional Investor [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock issued during period, shares, new issues						2,245,400
Proceeds from issuance of common stock, net of issuance costs						$ 9,300,000
Gross proceeds from sale of common stock						$ 10,000,000.0
Shares issued, price per share						$ 2.065
Class of warrant or right, exercise price of warrants or rights						$ 1.94
Warrants exercisable period						6 months
Warrants exercised						4,842,615
Issuance of common stock warrants to purchase						2,245,400
Warrants expiry period						5 years 6 months
2020 PIPE [Member] \| Pre Funded Warrant [Member] \| Healthcare-focused U.S. Institutional Investor [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock issued during period, shares, new issues						2,597,215						2,597,215
Shares issued, price per share						$ 2.055
Warrants exercised						2,597,215
Issuance of common stock warrants to purchase						2,597,215