Consolidated Statement of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ (3,188)	$ (1,383)	$ (5,361)
Adjustments to reconcile net income (loss) to net cash flows provided by operating activities:
Provision for loss/(gains) on accounts receivable	(23)	15	(15)
Loss on disposal of equipment	1,805	787	142
Share-based compensation	10,925	7,834	6,808
Inventory obsolescence	232	113	99
Depreciation and amortization	21,125	15,922	14,068
Amortization of deferred financing costs and loan discount	834	211	115
Changes in operating assets and liabilities:
Accounts receivable	166	(8,019)	410
Inventories	(6,808)	(3,338)	702
Prepaid expenses and other current assets	9,437	(11,969)	174
Operating lease right of use	1,289	432	0
Other assets	(719)	118	(262)
Accounts payable	(5,922)	2,777	195
Accrued expenses	(6,762)	13,082	1,531
Other lease liabilities	(1,198)	(265)	(31)
Net cash flows from operating activities	21,193	16,317	18,575
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of short-term investments	(20,000)	0	0
Proceeds from maturities of short-term investments	20,000	0	0
Investments in equity method investment	(27,894)	0	0
Acquisitions of property, plant and equipment, software and deposits on equipment	(134,568)	(70,633)	(16,274)
Net cash flows used in investing activities	(162,462)	(70,633)	(16,274)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from common shares issued in primary offering, net of issuance cost	252,062	0	0
Proceeds from exercise of options to purchase common stock	5,441	4,460	3,325
Tax withholdings related to net shares settlements of restricted stock units	(2,568)	(1,295)	(256)
Proceeds from borrowings under Credit Facilities	20,933	72,291	6,000
Repayment of borrowings under Credit Facilities	(76,000)	(18,500)	(6,000)
Financing fees paid in connection with borrowings	(824)	(723)	0
Net cash flows provided by financing activities	199,044	56,234	3,069
NET CHANGE IN CASH AND CASH EQUIVALENTS	57,775	1,917	5,370
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR	9,472	7,554	2,184
CASH AND CASH EQUIVALENTS, END OF PERIOD	67,247	9,472	7,554
SUPPLEMENTAL CASH FLOW INFORMATION:
Taxes paid	88	9	69
Interest paid	1,061	522	184
NON-CASH FINANCING AND INVESTING ACTIVITIES:
Property, plant and equipment purchases in accounts payable	11,281	7,575	851
Non-cash acquisitions of property, plant and equipment	$ 0	$ 1,750	$ 0