Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Cash Flows from Operating Activities:
Net loss	$ (12,613)	$ (7,529)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	301	204
Share-based compensation	1,196	501
Non-cash interest expense	782	177
Cost of rental units purchased by customers	70	27
Loss on extinguishment of debt	622
Changes in certain assets and liabilities:
Accounts receivable, net	383	(47)
Inventory	(104)	59
Net investments in sales-type leases	(368)	(360)
Leasehold reimbursement	836
Prepaid commission expense	(419)	(515)
Prepaid expenses and other assets	285	504
Accounts payable	(1,299)	(1,475)
Accrued expenses	(3,227)	(1,236)
Deferred revenue	(95)	120
Net Cash Used in Operating Activities	(13,650)	(9,570)	$ (30,500)
Cash Flows from Investing Activities:
Purchases of property and equipment and capitalized software	(266)	(274)
Net Cash Used in Investing Activities	(266)	(274)
Cash Flows from Financing Activities:
Proceeds from issuance of long-term debt	35,000
Repayment of long-term debt	(32,500)
Payments of debt issuance costs	(721)
Proceeds from exercises of stock options	76	1,407
Net Cash Provided by Financing Activities	1,855	1,407
Net Decrease in Cash and Cash Equivalents	(12,061)	(8,437)
Cash and Cash Equivalents, Beginning of Period	75,708	104,583	104,583
Cash and Cash Equivalents, End of Period	63,647	96,146	$ 75,708
Supplemental disclosure of cash flow information:
Cash paid for interest	1,403	737
Transfer of inventory to property and equipment		37
Supplemental disclosure of non-cash investing and financing activities:
Purchases of property and equipment and capitalized software in accounts payable and accrued expenses	$ 94	$ 44