Revenue Recognition - Information by Type (Details) - USD ($)	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue
Total Devices Revenue	$ 6,441,573	$ 5,096,056	$ 12,400,935	$ 9,925,534
Disposables and Services	2,313,755	1,909,043	4,350,428	3,848,134
Amortization of extended warranty agreements	470,268	371,686	911,826	711,268
Total revenue	9,225,596	7,376,785	17,663,189	14,484,936
MRI Compatible IV Infusion Pump Systems
Disaggregation of Revenue
Total Devices Revenue	4,550,542	3,590,538	8,743,296	7,216,160
MRI Compatible Patient Vital Signs Monitoring Systems
Disaggregation of Revenue
Total Devices Revenue	$ 1,891,031	$ 1,505,518	$ 3,657,639	$ 2,709,374

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

Name:	us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration